I think an honorable mention is in order to Yaesu for actually supplying a programmable part. Not many manufacturers do this and the faulty equipment just ends up as scrap. Well done to Peter as well of course.
As usual Peter I am honored to have the pleasure of being able to watch your work and follow along with your choices of diagnostic steps and methods. Thank you for sharing these videos and the education that comes with them. I only wish I would have discovered your channel and Buddy's many years ago.... 👍
Last time we had this condition it was the processor chip that was out due to static discharge of an ungrounded repair attempt by the owner. Great repair work, I wish I had the tools you do for such repair work most of all my repair work in on old style analog with bigger components, I wish I could do the MCU and CPUs on my boards that come in needing repair work done to them as you have done here. Saved that person a lot of money.
Awsome save of this radio Peter. I agree with replacing all those components, just never know what is damaged from electrical storms. As always thanks for sharing.
That was absolutely magnificent, I had an induced lightning surge kill my 857, after the warranty had expired. I sent it off to Yaesu for repair and the just stuck a radio in the case, and returned it to me. I think it cost $500, but I was unwilling to just scrap it. They did return the old board to me. If I ever get the courage up to troubleshoot and repair it sometime in the future, this video would be a very, very good tutorial. Realistically, I don't think it's ever going to be done, but it _would_ be interesting to know what's wrong with it. BTW the thermo-imaging camera app is a wonderful tool -- I had no idea it existed!
The work done in this FT857 was very good, and the explanations help a lot to understand the reasoning to reach the component responsible for generating the defect, but it is not enough to have modern and state-of-the-art equipment if you do not have the knowledge you have. Congratulations on the beautiful work done on this FT857. Big hug and recommendations to family and thank you
Amazing to watch you troubleshoot, Peter. I am nothing shy of impressed watching your thought processes in action on this one. Great job getting this radio back on the air.
WOW!!! What a fantastic video and repair job on the 857. You are an incredible technician. To repair all those very small parts plus the MCU I can’t imagine how much concentration that took. And helping the person to get his favorite radio back to him. Like so many people have said it is an honor to watch you work. Thank you for a wonderful video, I do hope you have a wonderful day and stay safe. Hello from the Texas Hill country. 73 WD5ENH Steve
What a great video Peter and a real journey. I’m really struggling to get spares at the moment and seem to be paying a lot more for them as well. Another superb piece of logical fault finding and a tricky microprocessor to swap out as well. Very well done. Regards Graham
I have recently invested in a thermal camera and I have to say that it is a real game changer for electronics fault finding. Fantastic video as always Peter.
This is a very good video, but I had the same type of damage on my FT857 but mine still worked but the audio was very bad, I sent the radio to our local Yaesu Dealers and it took them 2 years to just give me a quotation for repair, they wanted to replace the entire main board and the cost of that was more than the cost for a good second hand / used radio. Since then I will never buy a yaesu radio ever again as the support was very bad. Thank you for your video just sad I only got to watch it around a year later... keep it up.
What a great video, loved the 3 month older comment which was very funny and unexpected. Very skillful hands in replacing that processor. I also have a 857 which can be challenging with so many menu's and sub menu's but wow! what a great little radio. Thanks Peter and have a great weekend. de M5AXA (Ian)
Peter blown it is amazing you can work with such tiny components , I remember 1 time my Video recorder got hit with lighting was very lucky a Cap was blown to pieces great repair Peter :)
Fascinating fault! I would have guessed that it was a partially blown discrete component, that worked until under load. I'm not normally a fan of the "shotgun" approach (replacing a bunch of components) but agree with Buddy, a good idea given the cause of the fault was from an electrical storm. Love your videos, thanks for sharing!
Excellent success Peter. It reminds me of the video on the FT-847 whose CPU certainly had the same problem and which you couldn't fix. Finding a CPU with the right internal program is not easy. Well done and thank you for your videos!
Thank you. Yes you are right. The assumption was a faulty MCU very early but the radio was completely tinkered so the risk was too high to put more work and material in....
Peter simply Amazing job Excellent Job super learning Video for me. I am so impressed. Your the best I don't think Yaesu could have done better. You're one of the Best of the Best most important most people would not share their wealth of knowledge. I Love to watch TRX Lab videos trying to watch them all. Many Thanks
Good job Peter. EMP/Static shock takes out components with no exterior signs; a pain in the butt especially since both sides of the PC board are populated and testing is difficult. Thanks for the video.
Very nice repair job, Peter - "shotgun" servicing is a real gamble 50% of the time! Personally, I would always have first chased down the extra 32mA current drawn. The heat camera is SUCH a useful tool for diagnosis - but SO expensive!
@@TRXLab Yes indeed,... but I generally don't like the hassle of pulling out SMD parts unless I understand their failure mechanism. Chasing a solid current error just "feels" easier. Nevertheless, another job well done!
So spannend, besser als jeder Krimi ;-) You really have a steady hand and I can understand that you didn't film the soldering in of the MCU. Many thanks to you Peter 73 de Bernd
Great job, Peter! One comment only… when you 45:20 clean the tabs using solder wig, don‘t swipe the wig over the pads. Just wipe the iron over the (not moving) wig. The wig sucks all the solder from the pads just by the effect of adhesion, caused by the heat and flux applied to it. If you move the wig, you risk eroding (and /thus/ damaging) the pads.
Thanks for the video. The massive part replacement understood but probably lost some of the learning value. Also wondering if we could have used a scope and probed the cpu to verify it was the the problem. Would have been so interesting. Also the work on installing the cpu would have been so interesting. Such precise work. Your skills are outstanding. Thanks for another great video
Yes you are right but I have always to cut out sequences in order to shorten down the video a bit. But testing a CPU/ MCU with the scope has been presented in may older videos already and it is always the same procedure...Thanks for comment and glad that you liked the video...
probing cpu is useless. one needs to know the code/operation sequence. also u can't just buy a cpu and solder it on u need to program it first. and that is a lot of work. that's why u contact yaesu and buy it from them only. otherwise...
One of the guys in the club walked across the room and grabbed the knobs on his 857 and got a static spark and killed his radio just like this. He had to send it back to the Yaseu to get it repaired and it was new just out of the box.
Cudos to you, what a fantastic video. What type of flux do you use and what is the low temp solder and is the solder wick with or without flus? Fantastic to watch.
Great save and documentation. My FT891 had bad final transistors, leaking power voltage, and now has audio with no S-meter. Think I found the issue, seems many 891 radios have weak parts.
Nice video Peter and such clean work replacing the MCU. Did you have to adjust any of the soft settings after you fitted the new MCU? Also I am guessing the static discharge may have scrambled the firmware in the MCU EEPROM making it crash, it's lucky that you found a replacement that worked. Love the vids keep up the good work.
Thank you John and good to see you. No all adjustments were fine after replacement of the MCU. Even I did not get a clear answer from Yaesu it seems the the firmware in the MCU is a kind of operating system while all the parameters are stored in the external EEPROM which was not defect and thus all was still there... Again glad that you liked my video...
Have the same radio, original production and not the D version. Very nice work in restoring this classic! Interesting service monitor you have on the bench. Is there any reliable source for such equipment in the EU especially used equipment? I have an IFR 1200 with spectrum analyzer and it no longer turns on. Shipping back to the states is out of the question, customs would charge me an arm and a leg when it ships back to me even though I would declare it to them before shipping out.
Klasse Video danke das du die Arbeit mit der Welt teilst. Darf ich fragen wo man die schaltpläne in einer solch guten Qualität bekommt ich bräuchte Sie auch. Danke 73 Sebastian
As i own a 857 by myself, i like to see this one here back in service. So you did a good job, Peter, and the risk of failing is quite high after a HV / ESD event. Did you use Chip Quik solder for MCU removing? It looks more like a normal soft one. As always, the vid saved my sunday morning. 73 de Olaf, lieben Gruß nach HE und bleib gesund!
Danke Olaf, ja das Risiko ist hoch so eine Gerät nicht mehr repariert zu bekommen.. Ja es war Chip Quick und es funktioniert wirklich gut. Alles Gute und lieben Gruß! 73
Very nice work! I have also had this radio for about ten years and sometimes it can't be turned off with the button. The data on the display disappears, the radio turns off the sound, but the display stays on. I have to unplug it to turn it off. After that, it works normally again for a few weeks, as if the power relay remain on. OK2AQA Marcel
Another great video Peter. A lot of work to save a super transceiver. Could you tell me the manufacture of the ground clip and the probe tip for your multi meter. They look like they are very functional. Thanks
Hi Peter, another great repair from you, and we other learn a lot of things from you. But I have a question, when you solder IN that MCU - do you use a soldering iron or do you use hot air ?
It is very interesting to see that radios with various malfunctions come to you, often old, but everything is in perfect condition externally. In Ukraine, I often see very dirty radios with external damage ...
@@TRXLab Probably the same reason why we have here a lot of garbage everywhere, and people drive old stinking cars. Well-being starts with respect for yourself. The communist past taught ex-soviet people something completely different ... Even within the same country in Ukraine, the closer to the western border, the more well-groomed the houses and land ...
Of course not but it all happened so extremely fast that he was not able to get the PL connector screwed off so quickly. The learning he took away is to use in the future a BNC connector for the antenna to be able to get the koax away in a fraction of a second...
@@TRXLab but it sounds so at 0:36 : ... when he was touching the radio which of course he took with him into the car but the antenna was still connected ...
You sure do work on a lot of Yaesu 857's. Remind me to never buy an 857. On one radio you repaired, it was totally TTL logic and I counted over 51 transistors. At least you're not working behind a golden screwdriver. I would never be able to replace a main CPU. W Rusty Lane K9POW in eastern Tennessee
Thanks again . I would think that it would be helpful for both owners of rigs & guys getting into repair - to have some idea of costs for the fine work you ? I have an FT-897 with multiple issues that I need to work on , did a couple repairs already , like the VHF / UHF filters that typically go bad .
I had the filters on my FT.897 replaced, and when i got the radio back nothing worked. The radio wouldn't even turn on, but the guy who repaired it said it didn't work when he got it - but I am 100% sure it worked. So be careful.
@@aslerunarborgersen5175 Maybe your venting or something , but your reply has little to do with my commnet - except the idea of repalcing filters. Your comment should be a standalone comment - finding competent repair people , too bad you had a bad experience . I'll reiterate my point / question , not that Peter should , just thought it could help with added info - typical cost of repair - for both buyers & sellers . I would not be against some ideas from Peter on finding good help , but as I said - a comment on it's own .
@@KD0CAC You asked about the cost for a great technician like Peter, and I just added my comment on what may happend if you go to a cheap "technician" - you can end up with a (more) broken radio. I maybe should have added "cheap" in my comment, but I thoought you could understand what I meant.
@@KD0CAC Yes maybe it should be a "standalone comment" - but as I said, I just wanted to warn people against using cheap technicians. I don't know how much Peter will take for a repair, but he is worth every $ or maybe Euro. Take care, stay safe 73 LB5JG
This is one very compact radio that I am very interested in to use in my car and field camps. I love that it has all the modulations on so many bands. I would like to work SSB on VHF & UHF, which would be a new experience for me, and also to be able to have a chat with CB operators on 27 MHz too. I have been reading reviews on it and one thing really bothers me, lots of owners have complained that the LCD develops faults (blank lines) after some time, especially when it is used in a car (heat? cold? vibration? all?) What is your experience regarding this matter? Has any 857's came to you with LCD problems? Best regards from Istanbul, TA2KQ
Hi, I have a question regarding the FT857 is there a simple test I can do to find out if there are any noisy components in my FT857. The reason I ask is that the receiver seems noisier than usual. I have tried the disconnected aerial test but still, get noise I was under the impression that if you disconnected your antenna your receiver would be dead quiet. I noticed on this repair when you had disconnected the antenna there was still static. I live in New Zealand so sending it to you would be too expensive I do have an IFR1600 test set. What tests can I setup which would give a good indication as to what is happening.?
Hi Peter, I have a FT-857 which is behaving very much the same as the radio in this clip, powers on, display comes up, audio can be heard, will go into TX- then switch off after 3 seconds with display still illuminated. I did the same voltage checks as you with similar results. You replaced components in the switching section which didnt resolve problem and then did the CPU. Could you give me an idea of the MCU cost as that may alone may make repair attempt worth pursuing.
